Method of setting diamonds into tools.



. ELM. STRICKLAND.

METHOD OF SETTING DIAMONDS INTO TOOLS.

APPLICATION FILED NOV. I9, 1915.

1 ,178,687. Patented Apr. 11, 1916.

A IIIH;

' UNI/5M0? ELWIN M. STRICKLAND, OF DETROIT, MICHIGAN.

METHOD OF SETTING DIAMONDS INTO TOOLS.

Specification of Letters Patent.

Patented Apr. 11, 1916.

, Application filed November 19, 1915. Serial No. 62,384.

To all whom it may concern Be it known that I, ELWIN M. STRICK- LAND, acitizen of the United States, residing at Detroit, county of Wayne,State of Michigan, have invented a certain new and useful Improvement inMethods of Setting Diamonds into Tools, and declare the fol lowing to bea full, clear, and exact description of the same, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification. I

My invention relates to methods of setting diamonds into tools formechanical purposes and consists in the construction and means wherebythe diamond is securely held in such tool for mechanical purposes, suchas turning emery wheels, or any purpose for which such tools areemployed. 1

It is obvious that diamonds should be set in tools in such a manner thatthey can not be detached therefrom or loosened therein during themechanical operations which they are called upon to perform. The settingmust not only be rigid but the material in which they are set must besufliciently resistant to heat so that the setting will not melt or bedetached or loosened.

I accomplish the objects of my invention in the most perfect manner'bythe means hereinafter set forth and claimed.

In the drawings Figure 1 is a partial sectional, vertical and horizontalview, showing the first step in the process. Fig. 2, is a view showingthe second step of the construction of the tool with the upper portionas a plan view thereof. Fig.3, is a partial sectional view of the sametool diamond inserted therein and held for the purpose of cementing, ashereinafter stated, the upper portion being a plan view thereof. Fig.4:, is a partial sectional view of the same tool with a diamond insertedtherein and the matrix cast thereon, with the upperportion as a planview. Fig. 5, shows the completed tool with the point of the diamondexposed, the upper portion being a plan view also of the end of thetool.

Similar letters refer to similar parts.

In the drawings, A represents th head of the tool which may be attachedto a shank B or formed integral therewith and which may be adapted to beattached to any convenient holding tool. The holding portion but withthe A, formed from a solid bar, is drilled out I centrally at O, asshown in the lower ortion of Fig. 1. A circular cut or groove is formedwhich leaves a wall E of a cup formed between the groove D and the outerto face of the tool. This is the first step in the process of, formingthe holder. -There is also a circumferential inner wall F whichsurrounds the cavity C and extends to the outer face of the tool, asshown in Fig. 1. This is the first step in the formation of the tool.The next step consists in cutting notches G, G in the inner wall F.In'Fig. 2, I have shown six of these notches. These notches are cut deepenough and with a slight slope so that the bottom of the groovecommunicates with the central cavity C with an incline. This forms theinner wall Finto what is termed a castellated shape. This constitutesthe second step in the formation of the tool which is now ready for theinsertion of the diamond. In Fig. 3, I have shown the diamond H inposition; the dlamond is inserted in the central cavity C and the prongsof the castellated wall F are knurled down .over the diamond, as shownat F. This holds the'diamond in position but is not sufliciently rigidto enable it to do any work, as the diamond never, or seldom, conformsin its lower part H with the shape of the cavity 0. This forms the 5third step. In orderto fix the diamond firmly in position, metal of alower melting point than that of the tool, which is preferably made ofsteel, as for instance brass, is in the usual manner (with a flux)melted in and over the diamond, as shown in Fig. 4, at J. Thecastellated openings in the wall F permit this molten metal J to flowthrough and enter the cavity underneath the lower part of the diamond,as at J, filling all of the crevices that may exist and thusabsolutelyhold the diamond in a perfectly fitting matrix which is asrigid as the solidified metal itself. This forms the fourth step. In thefifth step the surplus metal J at the end of the tool, as at K, isground away, leaving the point of the diamond H exposed. The tool isthen finished.

It is obvious that any selected point can be e osed in the mannerspecified. It is also 0 vious that when the point is worn so as tobecome defective or useless the sealing metal can be melted out, thelips of the eastellated wall K raised, and, the diamond taken out andturned, when it can be sealed again in the same manner as hereinbeforedescribed.

I am aware that diamond-holding tools have been made with a castellatedwall and attempts have been made to seal the diamond in the centralcavity inclosed by such wall, but the difiiculty has been that thesealing material would run out and would not firmly hold the bottom ofthe diamond in the cavity. By making a cup-formed wall E, which has nogrooves or other outlets, I

am enabled to seal the diamond securely and surely in the mannerheretofore stated.

What I desire to claim is:

1. The process of attaching diamonds to tools for working purposes,consisting first in forming the tool with a central cavity to hold thediamond, an outer imperforate wall, an intermediate groove between saidwall sealing material melted into said cavity and surrounding saiddiamond leaving the point exposed for use, substantially as described.In testimony whereof, I sign this specification.

ELWIN M. STRICKLAND.

